drm/amd/powerplay: input check for unsupported message/clock index

This can avoid them to be handled in a wrong way without notice.
Since not all SMU messages/clocks are supported on every SMU11 ASIC.

Signed-off-by: Evan Quan <evan.quan@amd.com>
Reviewed-by: Feifei Xu <Feifei.Xu@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>